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"Humanizer" and "rewriter" are often used interchangeably, but they solve different problems. A rewriter rephrases for variety, paraphrase quality, or plagiarism avoidance. A humanizer specifically targets AI-detector evasion while preserving tone. SynthQuery offers both because they're useful in different workflows.
Use a humanizer when AI-detector flags are the bottleneck. Use a rewriter when paraphrase variety, tone-shift, or plagiarism risk are the bottleneck. SynthQuery includes both; standalone rewriters typically don't include detector-aware modes.
| Feature | Humanizer | AI Rewriter |
|---|---|---|
| Primary goal | Detector evasion + readability targeting (Humanizer); paraphrase variety (Rewriter) | Paraphrase variety, plagiarism avoidance |
| Detector-aware output | Yes — tested against built-in detector each pass | Rarely — most rewriters don't measure detector score |
| Tone preservation | 7 modes (academic, casual, business, creative, journalistic, plain, technical) | Synonym swap with limited tone control |
| Readability targeting | Target Flesch-Kincaid grade level | Generally not |
| Plagiarism avoidance | Yes — paraphrase preserves meaning while changing surface | Yes — primary use case |
| API access | REST API on Pro tier | Varies — many free rewriters have no API |
| Bundled detector check | Yes — one subscription | No — usually requires separate detector subscription |
| Free tier | Yes — limited words/month | Yes — many fully-free web rewriters |
| Output ownership | User retains full IP | Varies — read terms carefully |
| Languages | English (primary); limited multi-language | Often broad multi-language for synonym-swap rewriters |
| Pricing model | Flat $29/mo Pro | Free → $10–$30/mo for serious rewriters |
| Plan | Humanizer | AI Rewriter |
|---|---|---|
| Free | Yes — limited | Many fully-free web rewriters |
| Starter | $29/mo Pro (humanizer + rewriter + detector + plagiarism) | $10–$30/mo for serious tools |
| Pro | $79/mo Expert | $50+/mo enterprise |
Writers who need to rewrite or humanize content and validate the result against an AI detector in the same workflow, or hit specific readability targets across academic, business, or journalistic tone.
Quick one-off paraphrase tasks where the goal is variety or plagiarism avoidance, not detector evasion.